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The RMS (Rear Main Seal) issue has been discussed ad nauseum on this forum. Use the search function and type in "Rear Main Seal" (using "RMS" returns nothing) and you will get an extensive list of posts that will answer most of the current questions about the problem.
The IMS (InterMediate Shaft) issue has also been pretty thoroughly discussed, but much less so than the RMS.
Polls of Boxster owners on this and other forums seems to peg RMS failure frequency at 20%+. I have seen estimates other places that run as high as 50%.
One has to interpret the failure frequency figures as referring to "premature failure", since the seal itself has been described as a wear item that will eventually wear out and fail in 100% of the cars.
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